util: move futex helpers into futex.h

v2: style fixes

Reviewed-by: Marek Olšák <[email protected]> (v1)

1 files changed, 53 insertions, 0 deletions

diff --git a/src/util/futex.h b/src/util/futex.h
new file mode 100644
index 00000000000..722cdd35f67
--- /dev/null
+++ b/src/util/futex.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright © 2015 Intel
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef UTIL_FUTEX_H
+#define UTIL_FUTEX_H
+
+#if defined(HAVE_LINUX_FUTEX_H)
+
+#include <limits.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <linux/futex.h>
+#include <sys/syscall.h>
+#include <sys/time.h>
+
+static inline long sys_futex(void *addr1, int op, int val1, struct timespec *timeout, void *addr2, int val3)
+{
+   return syscall(SYS_futex, addr1, op, val1, timeout, addr2, val3);
+}
+
+static inline int futex_wake(uint32_t *addr, int count)
+{
+   return sys_futex(addr, FUTEX_WAKE, count, NULL, NULL, 0);
+}
+
+static inline int futex_wait(uint32_t *addr, int32_t value)
+{
+   return sys_futex(addr, FUTEX_WAIT, value, NULL, NULL, 0);
+}
+
+#endif
+
+#endif /* UTIL_FUTEX_H */